Probably a minorly paranoid question regarding all the safe sleeping guidelines - would you use a secondhand travel cot for a 4 month old? It doesn't have a mattress other than the basic base bit which is a bit padded. It comes from SIL and was only used a few times, but no idea where it's been stored, I think on top of a wardrobe or similar as they don't have a garage.
Would you use it for a couple of nights, or should I be super paranoid and err on the side of caution?